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What will happen if the magnetic field in a moving-coil galvanometer is not radial? |
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Answer» Suppose the magnetic field is uniform but not radial. Then, when the coil comes to rest after rotation through an angle θ, NIAB cos θ = Cθ (in usual notations). ∴ I ∝ \(\cfrac{\theta}{cos\,\theta}\) as N, A, B and C are constants in a particular case. Thus, the current is not directly proportional to the deflection. Hence, we cannot have a linear scale for measurement. |
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